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UNSW Postgraduate Course Lecture 3: Galaxy Formation

3. The evidence: what do galaxies look like?

Ellipticals (early type) vs. spirals (late type):

1. random motions dominate rotation in ellipticals
2. ellipticals are `pressure supported'
3. spirals have much more gas and dust
4. spirals have more young stars
5. no spiral structure in ellipticals
6. very few high redshift ellipticals in HDF
7. history of star formation in the universe
8. more ellipticals in clusters
9. large cluster ellipticals have been harassed